For 'local utility' vars - things like loop counters, short lived array indexes/pointers, collections data (the ubiquitous k,v for 'key', 'value') - things like

For 'local utility' vars - things like loop counters, short lived array indexes/pointers, collections data (the ubiquitous k,v for 'key', 'value') - things like that, even if a block of code whose scope they are tied to is in a 15-20 line range I'm totally fine with single-letter names. Also, on the flip side, if say my chunk of code is solely dedicated to operating on a single object I'm totally fine using a one-letter name for those vars as well. Like say 'Person p' or 'WebView w' etc. These are notable exceptions though, at least as far as I'm concerned.